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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets    
Available-for-sale investments $ 921.0 $ 935.9
Bank time deposits    
Assets    
Available-for-sale investments 14.1 24.1
Corporate debt securities    
Assets    
Available-for-sale investments 603.8 608.3
Asset-backed securities    
Assets    
Available-for-sale investments 162.2 151.5
U.S. government and agency securities    
Assets    
Available-for-sale investments 138.1 149.2
Municipal securities    
Assets    
Available-for-sale investments 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis    
Assets    
Cash equivalents 25.9 16.2
Investments held for deferred compensation plans 113.4 111.2
Derivatives 28.8 8.1
Assets 1,089.1 1,071.3
Liabilities    
Derivatives 16.1 39.3
Deferred compensation plans 113.0 111.6
Contingent consideration liabilities 181.6 186.1
Liabilities 310.7 337.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits    
Assets    
Available-for-sale investments 14.1 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities    
Assets    
Available-for-sale investments 603.8 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities    
Assets    
Available-for-sale investments 162.2 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities    
Assets    
Available-for-sale investments 138.1 149.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities    
Assets    
Available-for-sale investments 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1    
Assets    
Cash equivalents 10.9 16.2
Investments held for deferred compensation plans 113.4 111.2
Derivatives 0.0 0.0
Assets 180.1 184.3
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 113.0 111.6
Contingent consideration liabilities 0.0 0.0
Liabilities 113.0 111.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Bank time deposits    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Corporate debt securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Asset-backed securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | U.S. government and agency securities    
Assets    
Available-for-sale investments 55.8 56.9
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Municipal securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2    
Assets    
Cash equivalents 15.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 28.8 8.1
Assets 909.0 887.0
Liabilities    
Derivatives 16.1 39.3
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Liabilities 16.1 39.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits    
Assets    
Available-for-sale investments 14.1 24.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments 603.8 608.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments 162.2 151.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments 82.3 92.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities    
Assets    
Available-for-sale investments 2.8 2.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3    
Assets    
Cash equivalents 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 0.0 0.0
Assets 0.0 0.0
Liabilities    
Derivatives 0.0 0.0
Deferred compensation plans 0.0 0.0
Contingent consideration liabilities 181.6 186.1
Liabilities 181.6 186.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Bank time deposits    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Corporate debt securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Asset-backed securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | U.S. government and agency securities    
Assets    
Available-for-sale investments 0.0 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities    
Assets    
Available-for-sale investments $ 0.0 $ 0.0